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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 621 for “"Fourier transform infrared"”.
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Fourier transform infrared difference spectroscopy of bacteriorhodopsin
We have used the technique of Fourier transform infrared difference spectroscopy to study the photocycle and proton pump of bacteriorhodopsin (bR). By applying this method to the study of native bR and bR with modified chromophores, we have confirmed and extended the earlier resonance Raman results …
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Hyphenated fourier transform infrared spectrometry: techniques for separations and analysis
… to fall in the low (10 - 25) ng range. The infrared spectra are enhanced over those acquired with a flow cell interface because CO₂ absorbance bands no longer obscure a portion of the analyte absorption spectrum.
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Fourier Transform Infrared Spectroscopy for the measurement of GeSn/(Si)GeSn
… were designed, built, and aligned using a Bruker Fourier transform infrared (FTIR) set up to collect the emission from fabricated GeSn samples using an external source with an external photodetector.</p> <p>This thesis presents an optical setup of a Bruker FTIR spectrometer aligned with external …
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Fourier-Transform Infrared Studies of Polypropylene During Mechanical and Thermal Deformations
Infrared spectroscopy, which looks at short range order, provides information on the strength of molecular vibrational frequencies and intensities. The measurement of changes in vibrational frequency, (nu), and in the vibrational intensity, which are related to variations in the intramolecular and …
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Computation tools for the Fourier transform infrared (FT-IR) spectroscopic imaging
Over the pass 60 years, infrared (IR) spectral imaging has become an important tool with various applications such as identifying chemical distributions of biomedically relevant components in tissue, investigating biomedical and biological processes, and studying development of diseases …
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Breast cancer diagnosis using Fourier transform infrared imaging and statistical learning
… indicative of disease state and its progression. Infrared spectroscopic imaging biochemically characterizes breast cancer, both for the epithelial cells and the tumor-associated microenvironment. I utilized multiple breast tissue assignments and a supervised learning approach to create different …
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Application of Fourier-transform Infrared (FTIR) for Quality Control of Swiss Cheese
… on split, variability and grading, respectively. Fourier-transform infrared spectroscopy (FTIR) was used in different parts of this study. FTIR collects the mid-infrared spectra (4000-700cm-1), and the resulting wave numbers formed, were used to monitor water extracts of Swiss-type cheese during …
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Polymeric microfluidic platform combined with Fourier Transform infrared imaging to explore biomolecular reactions
… continuous-flow reactors (MCFMs) with Fourier Transform infrared (FTIR) imaging to obtain sub-millisecond temporal resolution and molecular-bond structural resolution. My thesis primarily focuses on developing polymeric MCFMs compatible with FTIR imaging and developing robust methods …
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Toward Rapid Silica Analysis of CPDM Samples using Portable Fourier Transform Infrared Spectrometry
… CPDM filter stub using portable direct-on-filter Fourier Transform infrared spectroscopy (DOF-FTIR) to rapidly quantify quartz, the primary analyte of silica in coal mines. The research consisted of four studies that developed and evaluated a three-step process for dust recovery, deposition, and …
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Supercritical fluid extraction/chromatography and Fourier transform infrared spectrometry: methods optimization and applications
… for supercritical fluid chromatography (SFC) and Fourier transform infrared spectrometry (FT-IR). In order to study the effects of a supercritical mobile phase on the resulting IR spectra, carbon dioxide was compared to xenon as a supercritical fluid mobile phase for flow cell SFC/FT-IR. A packed …
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In-situ Fourier transform infrared spectroscopy of chemistry and growth in chemical vapor deposition
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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Characterization and optimization of supercritical fluid chromatography with on-line Fourier transform infrared detection
… such as IR, exists for SFC. The interface of a Fourier Transform Infrared (FTIR) spectrometer to a packed column (analytical scale) SFC is demonstrated. Characterization of mobile phases for SFC-FTIR is presented. Also, parameters for the optimization of spectral sensitivity, such as mobile …
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Characterization of molecular dynamic changes in tissue model systems using Fourier transform infrared spectroscopic imaging
… changes in stroma and cellular responses and transformations upon the stimulation from growth factors and mechanical stress in cellular microenvironment. Finally, these issue models are applied to development of new quantitative method to study the dynamic diffusion of exogenous molecules in …
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Real time in-situ monitoring and control of silicon epitaxy by Fourier transform infrared spectroscopy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Use of Fourier transform infrared (FTIR) spectroscopy to determine the health-promoting index (HPI) of cow's milk
<p>Fourier transform infrared (FTIR) spectroscopy steadily has been gaining popularity for the analysis of milk components including total fat, protein, lactose, and ketones. To date, there have been few descriptions of the use of FTIR spectroscopy for the determination of milk fatty acid …
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Feasibility of analysis of polar compounds by high performance liquid chromatography with Fourier transform infrared spectroscopic detection
… separations employing on-line flow cell Fourier transform infrared spectroscopic detection were developed for polar compounds including phenols, alcohols, amines and azaarenes. Detection by FTIR gave information concerning hydrogen bonding and solvent effects occurring during the …
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Fourier transform infrared spectrometric detection of chromatographic effluents: instrumental and methodological improvements using a flow cell interface
The Fourier Transform Infrared spectrometer (FTIR) has been used increasingly as a detector for various forms of chromatography. Clearly the most established marriage has been that of the Gas Chromatograph (GC) with the FTIR. GC-FTIR has been developed well beyond other forms. The main objective of …
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Application of attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy to measure sub-lethal effects of potential mutagens
… Interrogation of biological samples using infrared (IR) techniques generates spectrum with wavenumber-absorbance intensities specific to biomolecules within the sample. Methods are relatively non-destructive, and so samples can subsequently be analyzed by more conventional approaches. …
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Use of fourier transform- infrared spectroscopic imaging as a tool for understanding early molecular events driving breast cancer progression
… important to study this characteristic cellular transformation in vitro. We report a direct comparison between α-SMA expression in primary normal human dermal fibroblasts and molecular spectra obtained through Fourier Transform infrared (FT-IR) spectroscopic imaging. Fibroblasts were stimulated …
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